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Linus Torvalds d4da6c9ccf Revert "ext4: Remove journal_checksum mount option and enable it by default" 
This reverts commit d0646f7b63, as
requested by Eric Sandeen.

It can basically cause an ext4 filesystem to miss recovery (and thus get
mounted with errors) if the journal checksum does not match.

Quoth Eric:

   "My hand-wavy hunch about what is happening is that we're finding a
    bad checksum on the last partially-written transaction, which is
    not surprising, but if we have a wrapped log and we're doing the
    initial scan for head/tail, and we abort scanning on that bad
    checksum, then we are essentially running an unrecovered filesystem.

    But that's hand-wavy and I need to go look at the code.

    We lived without journal checksums on by default until now, and at
    this point they're doing more harm than good, so we should revert
    the default-changing commit until we can fix it and do some good
    power-fail testing with the fixes in place."

See

	http://bugzilla.kernel.org/show_bug.cgi?id=14354

for all the gory details.

Requested-by: Eric Sandeen <sandeen@redhat.com>
Cc: Theodore Tso <tytso@mit.edu>
Cc: Alexey Fisher <bug-track@fisher-privat.net>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Mathias Burén <mathias.buren@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-11-02 10:15:27 -08:00
..
Kconfig ext4: drop ext4dev compat 2009-10-01 02:21:07 -04:00
Makefile
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acl.c
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acl.h
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balloc.c
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bitmap.c
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block_validity.c
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dir.c
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ext4.h Revert "ext4: Remove journal_checksum mount option and enable it by default" 2009-11-02 10:15:27 -08:00
ext4_extents.h ext4: Split uninitialized extents for direct I/O 2009-09-28 15:49:08 -04:00
ext4_jbd2.c
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ext4_jbd2.h ext4: Handle nested ext4_journal_start/stop calls without a journal 2009-09-29 11:01:03 -04:00
extents.c ext4, jbd2: Drop unneeded printks at mount and unmount time 2009-09-29 15:51:30 -04:00
file.c const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
fsync.c ext4: async direct IO for holes and fallocate support 2009-09-28 15:48:29 -04:00
hash.c
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ialloc.c
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inode.c [PATCH] ext4: retry failed direct IO allocations 2009-10-02 21:20:55 -04:00
ioctl.c
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mballoc.c ext4: Use tracepoints for mb_history trace file 2009-09-30 00:32:42 -04:00
mballoc.h ext4: Use tracepoints for mb_history trace file 2009-09-30 00:32:42 -04:00
migrate.c ext4: Split uninitialized extents for direct I/O 2009-09-28 15:49:08 -04:00
move_extent.c ext4: EXT4_IOC_MOVE_EXT: Check for different original and donor inodes first 2009-09-28 15:58:29 -04:00
namei.c ext4: Handle nested ext4_journal_start/stop calls without a journal 2009-09-29 11:01:03 -04:00
resize.c
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super.c Revert "ext4: Remove journal_checksum mount option and enable it by default" 2009-11-02 10:15:27 -08:00
symlink.c
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xattr.c
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xattr.h
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xattr_security.c
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xattr_trusted.c
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xattr_user.c
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